John dunlop



(No Model) J. DUNLOP.

SAFETY GAS COOK. No. 597,897 Patented Jan; 25,1898.

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UNITED STATES PATENT rrrcn.

JOHN DL'NLOP, OF MERIDEN, CONNECTICUT, ASSIGNOR OF ONE-HALF TO HUGH HIGGINSON, OF SAME PLACE.

SAFETY GAS-COCK.

SPECIFICATION forming part of Letters Patent No. 597,897, dated January 25, 1898.

Application filed February 10, 1897. fierial No. 622,752. (No model.)

To all whom it may concern: with the stop-pin half-way between the re- Be it known that 1, JOHN DUNLOP, a citizen cesses. of the United States, residing at Meriden, in Upon turning the plug in either direction the county of New Haven and State of Conthe stop-pin rides up the inclines toward the 5 necticut, have invented certain new. and usetop of the recesses, thereby moving the plug ful Improvements in Safety Gas-Cocks, of endwise against the force of the spring 8. which the following is a specification. When the stop-pin registers with the recesses, My invention relates to improvements in the spring causes the plug to snap down to its safety gascochs; and the object of my invenseat, with the stop-pin in said recesses, there- 0 tion is to fasten the plug of the cock in its by fastening the plug in its closed position. closed position by merelyturning the handle. In order to open the cook, it is only neces- In the accompanying drawings,Figure lis sary to pull the plug endwise against the a side elevation of my safety-cock. Fig. 2 is force of the spring to lift the pin out of the a vertical section thereof on the line a: of recesses, and then the plug can be turned in 15 Fig. 1. Fig. 3 is a sectional plan View of the either direction to open the cock. If the insame on the line y y of Fig. 1, and Fig. 4 is clines leading from the top of said recesses a side elevation of my safety gas-cock in a slant gradually to the point midway between slightly-modified form. them, the spring will have a tendency to bring Adesignates the bod y of the cock, the major the plug to or nearly to the position for fully 2o portion of which may be in any of the ordiopening the cock.

nary forms. In Fig. 4 I have shown substantially the B designates an ordinary tapering plug same construction excepting that the body A fitted to said body and provided with the is cut away only on one side of the recesses usual transverse passage 5 and a handle 6. 100, so that the plug B can be turned only I 2 5 Ialso provide said plug with astop-pin 7, that half -way around, and that the space over projects radially on opposite sides, (in the which the stop pin 77 passes is more abruptly preferred 'fOlI1Tl,) and with as pring 8 between inclined, leaving more of a flat place between the body A and head of the screw 9, acting the recesses, so that the spring does not act to hold the tapering plug firmly within its to open the cock to the same extent as it 80 30 seat in the body of the cock with a yielding does when the inclines are more gradual and pressure, so as to permit of an endwise movenearly meet each other, and therefore the ment of the plug, as hereinafter described. plug may be placed in any desired partially- That portion of the body which faces the open position within certain limits. It is stop-pin 7 is provided with recesses 10, exevident that the abrupt and separated in- 3 5 tending at a right angle to the ordinary pasclines can be used on both sides of the recess sage through the body, said passage being inin a cock where the plug may be given a comdieated by parallel broken lines 11 in Figs. 1 plete revolution. as Well as it can where the and 3,wherebythegas-cockisclosed whenever plug is limited to a half-revolution, as in the stop-pin rests in said recesses. These re- Fig. 4:. o cesses should be deep enough to permit the By my improvement the plug is fastened tapering plug to firmly seat itself under the in its closed position by the mere act of turninfluence of the spring 8. The top of the ing the plug, and that position is so plainly body between the recesses 10 is gradually indicated by the snapping of the stop-pin into depressed and at a point midway between the recess 0r recesses that one is not liable to 9 5 45 said recesses the body should be so low that accidentally leave the cock in its open posithe stop-pin when in said midway position, tion.

as it is when the gas-cock is fully opened, I claim as my inventionshall not bear hard enough upon the body 1. In a gas-cock, the combination of the to prevent the tapering plug from properly cock-body having the locking-recess with an 50 seating itself to make a tight joint. The incline by the side thereof that slants away drawings show the cock in its open position, from said recess, the plug having a stop-pin.

for engaging said incline and stop-recess, and a spring, acting to force the plug endwise to its seat and bring the stop-pin into said recess after running up said incline and to the bottom of said incline after leaving said stoprecess, the said incline and stop-recess both extending low enough to permit the plug to come to its seat both when the pin is in the locking-recess and when it runs down the in- I0 eline, substantially as described.

2. In a gas-cock, the combination of the cock-body having the recesses 10 and inclines on each side that slant away from said recesses, the plug having a stop-pin for engaging said recesses and a spring acting to force the plug endwise and bring thestoppin into said recesses substantially as described.

' JOHN DUNLOP. W'itnesses:

E. A. MERRIMAN, GEORGE L. KING. 

